Gage-glass.



C. ENDENHALL.

E GLASS.

APPLICATION FILED APR. 20, 1912.

Patented June 8, 1915.

WITNESSES 90 MW fit INVENTOR BY A ATTORNEY STATES CLARENCE IVI.MENDENHALL, OF NEW YORK, N. Y.

GAGE-GLASS.

Application filed. April 20, 1912.

' for securing the gage glass in the metallic part of the gage.

In gages, as heretofore constructed, it is quite usual to place the gageglass or glasses in recesses formed in the metallic part of the gage andsecure it or them in place by means of packing holding strips or ringswhich serve the double purpose of holding the glass in place and ofcompressing the packing to prevent leakage around the edges of theglass. Owing to the great changes in temperature to which the gageglasses are exposed breakage of the glass is a very usual occurrence andto prevent or minimize such breakage it has been suggested to use inplace of a long sight glass rows of bulls-eyes and in my own experienceI have successfully used such bulls-eyes of the special constructiondescribed in my pending application for Letters Patent filed March 3,1910, Serial Number 547,011.

I have found by experience however that even with the bulls-eye glassbreakage of the glass is apt to occur and to provide for suchoccurrences and to minimize their danger is the object of my presentinvention, which consists, broadly speaking, in providing a packingholder which has, in addition to its packing holding face, a flange orflanges adapted to extend inwardly from the holder at a higher levelthanits packing holding face and to extend over a portion of the glasslyingwithin the holder so that in case of breakage of the sight glassthe flange or flanges of the holder will tend to prevent the blowing outof the glass and consequent free escape of steam or water from the gage.By preference, and because the inwardly extending flange of the holderwill necessarily obscure more or less the face of the sight glass I formthe supplemental holding devices of the packing holder as a series ofsupported fingers or flanges leaving Specification of Letters Patent.

Patented June 8, 1915.

Serial No. 692,188.

the greater part of the sight glass lying within the packing ring properand fully exposed as is now usually the case.

Reference being now had to the drawings which illustrate my invention inthe form in which I prefer to employ it, Figure 1 is a cross sectionalview through a portion of a 1 gage showing the manner in which myimproved packing ring is employed in securing a bulls-eye sight glass inplace. Fig. 2 is a plan or top view of the improved packing holdingring. Fig. 3 a cross section of the ring on the line 33 of Fig. 2, andFig. a cross section of the ring on the line i4.- of Fig. 2.

The metallic portion of the gage shown in Fig. 1 is of a usual type, theframe being indicated at F, the water or steam space at F and thecircular space for the bulls-eye glass being indicated at F the seatfor. the glass being indicated at F.

G is the bulls-eye gage glass having flanges G which rest on theshoulder F 21 prismatic inner face indicated at G and a cylindricalextension G extending up from the flanges G and terminating in apreferably concave face G The construction of this bulls-eye sight glassis that devised by me and forming the subject matter of my pendingapplication above mentioned.

H is the packing which is placed in the recess F above the flange G ofthe sight glass and held in place by the packing ring A which, as shown,is of circular outline, having its outer face (1 externally threaded toscrew into the threaded recess F and clamp the packing H against theflange of the sight glass.

B is the packing holding face of the packing ring; E E, etc., recessesformed in the upper face of the packing ring to provide convenientholding points for a spanner wrench or other means employed to screw thepacking ring A into and out of the threaded recess F D D, etc., areinwardly extending fingers or flanges situated above the packing holdingface of the ring and adapted to extend over portions of the sight glasslying within the ring.

It will readily be seen that in case the sight glass is fractured insuch a way as to release it from the ordinary holding face of thepacking ring that its expulsion from the gage will be prevented by theinwardly extending flanges or fingers D D and thus the dangers incidentto the breaking of gage glasses Will be greatly diminished if notentirely overcome.

Having noW described my invention, What I claim as new and desire tosecure by Letters Patent is,

1. In a gage, the combination of a gage body formed With a sightaperture, a gage glass closing said aperture and formed With a bodyportion and With a marginal flange at the inner side of said bodyportion and a glass retaining member surrounding said body portion andacting against said flange and formed With a portion projecting in frontof the outer face of the body portion of said glass. I

2. In a gage, the combination of a gage body formed With a sightaperture, a gage glass closing said aperture and formed with a bodyportion and With a marginal flange at the inner side of said bodyportion, a packing holder surrounding the'body portion of said glass,and a packing interposed between said holder and flange, said'holderbeingprovided With a series of separated flanges projecting in front ofthe outer face of the body portion ofsaid glass.

I CLARENCE MENDENHALL.

Vitnesses i RUssELL BUNOE, I. A. BOOTH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner 01! Patents,

Washington,D. 0.

